The document discusses the construction of various types of ships including general cargo ships, tankers, bulk carriers, ore carriers, container ships, and passenger ships. General cargo ships have large cargo holds accessible via hatches and use tween decks for flexibility. Tankers have cargo areas divided into individual tanks. Bulk carriers transport bulk commodities in a single cargo hold. Ore carriers similarly use the center hold for ore and wing tanks for ballast. Container ships carry standardized containers stacked in multiple cargo holds. Passenger ships have extensive superstructure and facilities to accommodate travelers.
A bulk carrier, bulk freighter, or bulker is a merchant ship specially designed to transport unpackaged bulk cargo, such as grains, coal, ore, and cement in its cargo holds.
Today's bulkers are specially designed to maximize capacity, safety, efficiency, and durability.
Today, bulkers make up 15% - 17% of the world's merchant fleets and range in size from single-hold mini-bulkers to mammoth ore ships able to carry 400,000 metric tons of deadweight (DWT).
A bulk carrier, bulk freighter, or bulker is a merchant ship specially designed to transport unpackaged bulk cargo, such as grains, coal, ore, and cement in its cargo holds.
Today's bulkers are specially designed to maximize capacity, safety, efficiency, and durability.
Today, bulkers make up 15% - 17% of the world's merchant fleets and range in size from single-hold mini-bulkers to mammoth ore ships able to carry 400,000 metric tons of deadweight (DWT).
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1. Ship’s Constructions
General cargo ships
1. The general cargo consists of as large a clear open cargo-carrying
space as possible, together with the facilities required for loading and
unloading the cargo.
2. Access to the cargo storage areas or holds is provided by openings in
the deck called hatches. Hatches are made as large as strength
considerations will allow to reduce horizontal movement of cargo
within the ship.
3. Hatch covers of wood or steel, as in most modern ships, are used to
close the hatch openings when the ship is at sea. The hatch covers are
made watertight and lie upon coamings around the hatch which are set
some distance from the upper or weather deck to reduce the risk of
flooding in heavy seas.
2. 4. One or more separate decks are fitted in the cargo holds and are known
as tween decks. Greater flexibility in loading and unloading, together
with cargo segregation and improved stability, are possible using the
tween deck spaces.
5. Various combinations of derricks, winches and deck cranes are used
for the Handling of cargo.
6. The accommodation and machinery spaces are usually located with
one hold between them and the aft peak bulkhead.
3. Tankers
1. The tanker is used to carry bulk liquid cargoes, the most common type
being the oil tanker.
2. The oil tanker has the cargo-carrying section of the vessel split up into
individual tanks by longitudinal and transverse bulkheads.
3. Double bottom or/and double sides or double hull is fitted in the cargo-
carrying section of an oil tanker.
4. A pair of wing tanks are created by longitudinal bulkheads. These wing
tanks helps reduces the free surface effect.
5. Large amounts of piping are to be seen on the deck running from the
pump rooms to the discharge manifolds positioned at midships, port
and starboard.
4.
5. 1. LNG tankers carry methane and other paraffin products
obtained as byproduct of petroleum drilling operations. The
gas is carried at atmospheric pressure and temperatures as
low as - 164 °C in tanks of special materials, which can
accept the low temperature. The tanks used may be prismatic,
cylindrical or spherical in shape and self-supporting or of
membrane construction.
2. LPG tankers carry propane, butane, propylene, etc., which
are extracted from natural gas. The gases are carried either
fully pressurized, part pressurized part refrigerated or fully
refrigerated. The fully pressurized tank operates at 1800 kPa
and ambient temperature, the fully refrigerated tank at 25 kPa
and - 50 °C. Tank shapes are prismatic, spherical or
cylindrical. Low temperature steels may be used on the hull
where it acts as a secondary barrier.
6. Bulk/ore carriers
1. Bulk carriers are single-deck vessels, which transport single-commodity cargoes
such as grain, sugar and ores in bulk.
7. 2. The general-purpose bulk carrier, in which usually the central hold
section only is used for cargo
3. The partitioned tanks which surround it are used for ballast purposes
either on ballast voyages or; in the case of the saddle tanks, to raise the
ship's center of gravity when a low density cargo is carried.
4. Some of the double-bottom tanks may be used for fuel oil and fresh
water.
5. The saddle tanks also serve to shape the upper region of the cargo hold
and trim the cargo. Large hatchways are a feature of bulk carriers,
since they reduce cargo-handling time during loading and unloading.
8. Ore carriers
1. An ore carrier has two longitudinal bulkheads, which divide the cargo
section into wing tanks port and starboard, and the center hold, which
is used for ore.
2. On loaded voyages the ore is carried in the central hold, and the high
double bottom serves to raise the center of gravity of this very dense
cargo.
3. Two longitudinal bulkheads are employed to divide the ship into center
and wing tanks which are used for the carriage of oil cargoes.
4. When ore is carried, only the center tank section is used for cargo.
9. 5. A double bottom is fitted beneath the center tank but is used only for
water ballast.
6. The structure is significantly stronger, since the bulkheads must be oil
tight and the double bottom must withstand the high-density ore load.
7. Large hatches are a feature of all bulk carriers, to facilitate rapid
simple cargo handling.
8. A large proportion of bulk carriers do not carry cargo-handling
equipment, because they trade between special terminals which have
particular equipment for loading and unloading bulk commodities.
10. Container ships
1. A container is a re-usable box of 2435 mm by 2435 mm section, with
lengths of 6055, 9125 and 12 190 mm.
2. Containers are in use for most general cargoes, and liquid-carrying
versions also exist. In addition, refrigerated models are in use.
3. The cargo-carrying section of the ship is divided into several holds
which have hatch openings the full width and length of the hold.
4. Cargo handling consists only of vertical movement of the cargo in the
hold.
11. 5. Containers can also be stacked on the hatch covers where a low-
density cargo is carried.
6. The various cargo holds are separated by a deep web-framed structure
to provide the ship with transverse strength.
7. The ship section outboard of the containers on each side is a box-like
arrangement of wing tanks, which provides longitudinal strength to the
structure. These wing tanks may be utilized for water ballast.
8. A double bottom is also fitted which adds to the longitudinal strength
and provides additional ballast spacer
12. Passenger ships
1. The passenger traveling in such a ship pays for, and expects, a superior
standard of accommodation and leisure facilities.
2. Large amounts of superstructure are therefore an essential feature of
passenger ships.
3. Several tiers of decks are filled with large open lounges, ballrooms,
swimming pools and promenade areas.
4. Stabilizers are fitted for reduce rolling and bow thrust devices are
employed for improved maneuverability.